diff --git a/pigx-flow/pigx-flow-engine/pigx-flow-engine-biz/src/main/java/com/pig4cloud/pigx/flow/engine/node/MultiInstanceHandler.java b/pigx-flow/pigx-flow-engine/pigx-flow-engine-biz/src/main/java/com/pig4cloud/pigx/flow/engine/node/MultiInstanceHandler.java
index be8524a26..399fed454 100644
--- a/pigx-flow/pigx-flow-engine/pigx-flow-engine-biz/src/main/java/com/pig4cloud/pigx/flow/engine/node/MultiInstanceHandler.java
+++ b/pigx-flow/pigx-flow-engine/pigx-flow-engine-biz/src/main/java/com/pig4cloud/pigx/flow/engine/node/MultiInstanceHandler.java
@@ -71,7 +71,7 @@ public class MultiInstanceHandler {
 			Object variable = execution.getVariable(format);
 			String variableJson = objectMapper.writeValueAsString(variable);
 
-			List<NodeUser> nodeUserDtos = objectMapper.readValue(variableJson, new TypeReference<>() {
+			List<NodeUser> nodeUserDtos = objectMapper.readValue(variableJson, new TypeReference<List<NodeUser>>() {
 			});
 			if (CollUtil.isNotEmpty(nodeUserDtos)) {
 				List<Long> collect = nodeUserDtos.stream().map(NodeUser::getId).collect(Collectors.toList());